Feature request: flags for other parts of system prompt: memory, tools, environment

Summary

Add flags to selectively disable system prompt.

Problem

Even with --system-prompt '', CLAUDE.md and the tool list get loaded into
context -- waste of time and tokens for one-off questions unrelated to any
project.

Proposed solution

New flags:

• --no-memory - disables loading CLAUDE.md
• --no-tools - disables the tool list (and disables them)
• --no-env - disables the environment part (os, cwd, date)

Usage

# `tldr`-type questions
claude -p "generate a bash oneliner to find files created today" --no-memory --no-tools --no-env

# project-agnostic queries
claude -p "delete all .tmp files recursively" --no-memory